Thanks Maarten & Steven, I have to change the analyses for LOS.
However, I've picked a wrong example here since I have some other
skewed variables for which KW test remains appropriate I think (eg.
triglyceride level). Can you suggest how to perform the analysis using
Stata?
Thanks in advance.
Aca
On Fri, Oct 31, 2008 at 4:24 PM, Maarten buis <[email protected]> wrote:
> --- "Aca N.T." <[email protected]> wrote:
>> I have a simple question about testing length of stay (LOS)
>> differences among 5 groups. The response variable (LOS) has a skewed
>> distribution. I have previously transformed the LOS (log
>> transformation) and tried parametric statistic (ANOVA using
>> svy:regress), but not happy when performing back-transformation for
>> SD/SE. I rarely used non-parametric statistics before even for
>> non-survey data, so really this issue is a hassle for me. I believe,
>> however, that Stata has a test equivalent to Kruskal-Wallis for
>> survey data.
>
> The conventional way of analysing length of stay data is using survival
> analysis. So I would -stset- the data, and than use -sts test- to do
> the test. You can specify weights in the -stset- command. See:
> -help stset- and -help -sts test-.
>
> Hope this helps,
> Maarten
>
>
>
>
>
> -----------------------------------------
> Maarten L. Buis
> Department of Social Research Methodology
> Vrije Universiteit Amsterdam
> Boelelaan 1081
> 1081 HV Amsterdam
> The Netherlands
>
> visiting address:
> Buitenveldertselaan 3 (Metropolitan), room N515
>
> +31 20 5986715
>
> http://home.fsw.vu.nl/m.buis/
> -----------------------------------------
>
>
>
> *
> * For searches and help try:
> * http://www.stata.com/help.cgi?search
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
